CVE-2020-8492

python: wrong backtracking in urllib.request.AbstractBasicAuthHandler allows for a ReDoS

Severity Score

6.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Python 2.7 through 2.7.17, 3.5 through 3.5.9, 3.6 through 3.6.10, 3.7 through 3.7.6, and 3.8 through 3.8.1 allows an HTTP server to conduct Regular Expression Denial of Service (ReDoS) attacks against a client because of urllib.request.AbstractBasicAuthHandler catastrophic backtracking.

Python versiones 2.7 hasta 2.7.17, versiones 3.5 hasta 3.5.9, versiones 3.6 hasta 3.6.10, versiones 3.7 hasta 3.7.6 y versiones 3.8 hasta 3.8.1, permiten a un servidor HTTP conducir ataques de Denegación de Servicio de Expresión Regular (ReDoS) contra un cliente debido a un backtracking catastrófico de la clase urllib.request.AbstractBasicAuthHandler.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-01-30 CVE Reserved
2020-01-30 CVE Published
2024-05-25 EPSS Updated
2024-08-04 CVE Updated
2024-08-04 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-400: Uncontrolled Resource Consumption

CAPEC

References (18)

URL	Tag	Source
https://lists.apache.org/thread.html/rdb31a608dd6758c6093fd645aea3fbf022dd25b37109b6aaea5bc0b5%40%3Ccommits.cassandra.apache.org%3E	Mailing List
https://lists.apache.org/thread.html/rfec113c733162b39633fd86a2d0f34bf42ac35f711b3ec1835c774da%40%3Ccommits.cassandra.apache.org%3E	Mailing List
https://lists.debian.org/debian-lts-announce/2020/07/msg00011.html	Mailing List
https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html	Mailing List
https://security.netapp.com/advisory/ntap-20200221-0001	Third Party Advisory

URL	Date	SRC
https://python-security.readthedocs.io/vuln/urllib-basic-auth-regex.html	2024-08-04

URL	Date	SRC
https://github.com/python/cpython/pull/18284	2023-11-07

URL	Date	SRC
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00003.html	2023-11-07
https://bugs.python.org/issue39503	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7WOKDEXLYW5UQ4S7PA7E37IITOC7C56J	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A5NSAX4SC3V64PGZUPH7PRDLSON34Q5A	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APGWEMYZIY5VHLCSZ3HD67PA5Z2UQFGH	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UESGYI5XDAHJBATEZN3MHNDUBDH47AS6	2023-11-07
https://security.gentoo.org/glsa/202005-09	2023-11-07
https://usn.ubuntu.com/4333-1	2023-11-07
https://usn.ubuntu.com/4333-2	2023-11-07
https://access.redhat.com/security/cve/CVE-2020-8492	2020-11-04
https://bugzilla.redhat.com/show_bug.cgi?id=1809065	2020-11-04

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				>= 2.7.0 <= 2.7.17 Search vendor "Python" for product "Python" and version " >= 2.7.0 <= 2.7.17"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				>= 3.5.0 <= 3.5.9 Search vendor "Python" for product "Python" and version " >= 3.5.0 <= 3.5.9"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				>= 3.6.0 <= 3.6.10 Search vendor "Python" for product "Python" and version " >= 3.6.0 <= 3.6.10"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				>= 3.7.0 <= 3.7.6 Search vendor "Python" for product "Python" and version " >= 3.7.0 <= 3.7.6"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				>= 3.8.0 <= 3.8.1 Search vendor "Python" for product "Python" and version " >= 3.8.0 <= 3.8.1"		-		Affected
Opensuse Search vendor "Opensuse"		Leap Search vendor "Opensuse" for product "Leap"				15.1 Search vendor "Opensuse" for product "Leap" and version "15.1"		-		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				12.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "12.04"		-		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				14.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "14.04"		esm		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				16.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "16.04"		esm		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				18.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "18.04"		lts		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				19.10 Search vendor "Canonical" for product "Ubuntu Linux" and version "19.10"		-		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				20.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "20.04"		lts		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				31 Search vendor "Fedoraproject" for product "Fedora" and version "31"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				32 Search vendor "Fedoraproject" for product "Fedora" and version "32"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected